Science 9 Quarter 1 (Respiratory and Circulatory System)

• Respiratory system


  Also known as the human breathing system, responsible for taking in oxygen and expelling carbon dioxide
• Parts of the respiratory system

  • Nose and mouth
  • Nasal cavity or nasal passageways
  • Pharynx
  • Larynx
  • Trachea
  • Lungs
  • Bronchi
  • Bronchioles
  • Alveoli
• Inhalation


  1. Oxygen enters the body

  2. Ribs move out, chest space increases

  3. Diaphragm muscle contracts, moves down
• Exhalation


  1. Carbon dioxide exits the body

  2. Ribs move in, chest space decreases

  3. Diaphragm muscle relaxes, moves up
• Circulatory system


  Also known as the cardiovascular system, the life support structure that nourishes cells and delivers materials in the body
• Major parts of the circulatory system

  • Heart
  • Blood vessels (arteries, veins, capillaries)
  • Blood
• The heart is a hollow muscle as big as your fist
• Parts of the heart

  • Right atrium
  • Left atrium
  • Right ventricle
  • Left ventricle
  • Tricuspid valve
  • Bicuspid valve
  • Pulmonary valve
  • Aortic valve
  • Superior vena cava
  • Inferior vena cava
  • Pulmonary artery
  • Pulmonary vein
  • Aorta
• Circulatory system function


  Air enters lungs, goes to left side of heart, pumped through body, oxygen and nutrients delivered to cells, carbon dioxide transported back to right side of heart, expelled through lungs
• Types of circulation


  • Pulmonary circulation
  • Coronary circulation
  • Systemic circulation
• There are three types of blood vessels: arteries, veins, and capillaries
• There are two types of blood vessels: arteries and veins
• Blood carries oxygen, nutrients, hormones, waste products, and other substances to and from cells